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All Journal INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Sandyanto Adityosulindro
Environmental Engineering Study Program, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok, West Java, Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Environmental Science

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SIDOARJO VOLCANIC MUD AS PROMISING FENTON CATALYST FOR REMOVAL OF CONGO RED DYE Samuel Parningotan; Lucky Caesar Direstiyani; Sandyanto Adityosulindro
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 7, NUMBER 2, OCTOBER 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v7i2.20772

Abstract

Sidoarjo mud is a volcanic mud (VM) that continues erupting in Sidoarjo to this day. The VM has the potential to be used in water treatment technology as a reagent or catalyst due to enormous amount of discharged flow and rich mineral content. Heterogeneous Fenton is one promising process for maximizing the VM potential, however customization is essential to optimize the process. Aim: This study aimed to investigate the catalytic abilities of Sidoarjo VM in Fenton oxidation by several modification approaches, such as calcination (CVM), impregnation-calcination (ICVM), and unmodified (UVM). Methodology and results: Fenton oxidation was carried out in a batch reactor system with the following conditions: initial congo red (CR) concentration= 50 mg/L; VCR=300mL pH=2; agitation speed=300 rpm; catalyst dosage=0.5 g/L; dan H2O2 concentration=485 mg/L. The highest performance results were achieved when the process was combined with adsorption, at 90% (CVM), 55% (ICVM), and 52% (UVM), respectively. Conclusion, significance, and impact study: The Sidoarjo volcanic mud shows high potential as a Fenton catalyst in the UVM modification technique with CVM reveals to be more suitable as an adsorbent.
MODIFICATION OF ALUM SLUDGE AS ADSORBENT FOR REMOVAL OF RHODAMINE-B DYE IN WATER Sandyanto Adityosulindro; Siti Annisa; Denny Halim; Kusrestuwardhani
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 1, APRIL 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i1.21295

Abstract

Water treatment plants (WTP) in Indonesia generally use a physical-chemical process that generates a massive volume of sludge as waste. This sludge is typically discharged into the river without sufficient treatment due to land availability and/or treatment cost constraints. Aim: This study aimed to recycle the alum sludge from a drinking water treatment plant as an adsorbent for removing dye from wastewater. Methodology and results: Alum sludge was activated by several methods including calcination at 400oC and 600oC (AS-CAL400 and AS-CAL600), gelation (AS-GEL), synthesis of TiO2-alum sludge composites (TiO2@AS), and synthesis of ZnCl2-alum sludge composites (ZnCl2@AS). The adsorbents were characterized by SEM-EDS, XRF, BET, and pHPZC. The adsorption assays were carried out in a batch system and used synthetic wastewater containing Rhodamine-B dye as a model contaminant. The result shows that the highest dye removal of up to 87% was obtained using ZnCl2@AS adsorbent, contact time of 2 hours, the adsorbent concentration of 3 g/L, initial dye concentration of 50 mg/L, and pH 2. Conclusion, significance and impact study: The conclusion shows that recycled alum sludge, especially when activated with ZnCl₂, is highly effective for removing Rhodamine B dye from wastewater. It achieved 87% removal efficiency and 26 mg/g adsorption capacity under optimal conditions. The adsorbent has a rough surface with a 128.60 m²/g area, and its adsorption behavior follows the Freundlich isotherm and pseudo-second-order kinetics. Further research including long-term use, and application in real dye wastewater should be conducted to evaluate the feasibility of this adsorbent.
Co-Authors Denny Halim Kusrestuwardhani Lucky Caesar Direstiyani Samuel Parningotan Siti Annisa